Machine for manufacturing pins



` H. PRYM y MACHINE FOR MANUFACTURING PINS Patented Feb. 14,1928.

UNITED STATES 1,659,216 PATENT OFFICE.

HANS PRYM, OF STOLBERG, GERMANY.

MOACHINE FOR MANUFACTURING PINS.

Applicaton'led June 16, 1925, Serial No. 37,533, and in Germany .Tune 21, 1924.

My invention relates to improvements in machines for manufacturing pins, and more particularly in machines of the type in which the wire from which the pins are made is intermittently advanced by means of grippers or tongues, the head is formed thereon by means of a hammer, the desired llength of the pin is cut from the blank, and

the pin is carried to a grinding apparatus for grinding the point thereon.` Machines of this construction have a velocity-of from 150 to 200 revolutions perminute. In machinesv as now constructed the number of revolutions cannot be increased, because the tools and the driving means thereof are comparatively long so that they are subject to oscillations at higher velocities. This objection cannot be obviated by providing a stronger gearing, which would on the contrary increase the oscillations by the increase of the masses.

The object of the improvements is to rovide a machine of the class referre to which can be operated at high velocity, and with this object in view I dispose the tools and the gripping means therefor relatively to each other in such a way that the said gripping means and the gearing intermedisimple in construction. In my improved machine thelength of the levers and other parts intermediate the main driving shaft and the tools is made comparatively small by disposing the said driving shaft in a direction parallel to the movement of the blank and perpendicular to the tools, the said shaft being preferably disposed in a horizontal plane. My improved machine is distinguished from machines now in use in which the main driving shaft is disposed transversely of the direction of the movement of the 'blank and substantially within the plane of the driving apparatus.

Another objection'to the construction of machines now in use is that the point-s of the pins made thereby are not uniform, the reason being that, by reason of the small output of the machine, the pins are moved at comparatively great relative distances within the grinding apparatus, so that they set themselves in inclined position when being ground. By increasing the velocity ofthe machine the pins are presented to the grinding apparatus in close proirimity to one another, so that they are vertical in position and present uniform nesistance to the grinding roller. Thereby also the high circumferential velocity of the grinding roller is utilized.

For the purpose of explaining the invention an example embodying the same has been shown in the accompanying drawings, in which the same reference characters have `been used in all the views to indicate correshowing in addition the manner of mounting the movable clamping jaw,

Fig. 6, is an elevation looking from the left in Fig. 4,

Fig. 7, is a detail View showing the manner of mounting the tubular portion of the cutting apparatus,

Fig. 8, is a top-plan view of Fig. 7,

Fig. 9, is a detail view showing the 'ham- 4 -mer for heading the pins, ate the same and the tools are short and Fig. 10, is a detail view partly in section showing the blank feeding slide,

Fig. 11, is an elevation looking from the left-in Fig. 10,

Fig. 12, is a detail View showing the cam operating the blank feeding slide, and

Fig. 13, is a section taken on the line 14-14 of Fig. 12. i

In the example shown in the drawings the machine consists of a table 64 having a main driving shaft 65 mounted thereon, which shaft carries a pulley 16 and cams 17, 18, 19, 20 and 21. At the side of the table opposite to the shaft 65 a guide way 22 is provided, in which two slides 23 and 24 have reciprocating movement, said slides being adapted to be operated by means of levers 25 and 26 having rocking supports at 27 and 28 and engaged by the cams 17 and 1,8. The object of the slide 23 is to impart intermittent feeding movement to the blank or wire 29 for feeding uniform lengths thereof to the cutting and heading apparatus, and the object of the slide 24 is to impart additionalfeeding movement to the wire, the .end of the blank being thus presented to the hammer for being headed in two steps. At the delivery end of the guide way 22 there is a wire cutting apparatus 30, 31 operated by a lever 32 having its fulcrum on the table at 33 and adapted to be reciprocated within a vertical plane by means of the cam 19 engaging a roller 34 carried by the lever. At the delivery end of the cutting apparatus 30, 3l there is a blank clamping apparatus comprising a jaw 36 fixed to the table and a movable jaw 37 guided at 38 and adapted to be operated by means of the cam 20. In front of the delivery end "of the clamping jaws 36, 37 there is a hammer 40 guided in a block 41 mounted on the table 64 and actedV upon by a lever 42 rockingly mounted at 43-and acted upon by the cam 21, the said lever being adapted to be reciprocated within a horizontal plane and towards and away from the hammer 40.

rIhe general constructi'on'of the tools so far described and the operation thereof are known in the art, the novel feature residing in mounting the main driving shaft parallel to the movement of the wire and substantially in a horizontal plane including the wire and the axes of the tools. Thereby I am enabled to operate the tools from the shaft by means of simple and short levers and rods mounted perpendicularly to the shaft.

The construction of the wire feeding slides 23 and 24 has been shown in detail in Figs. 11 and 12. The general construction of the said slides 23 and 24 is the same and I shall describe the construction only with reference to the slide 23. As shown the slide 23 is in the form of a U-shaped yoke, and to the to`p face of the web portion of the yoke a steel plate 47 is secured. Above the plate 47 there is a movable clamping plate 48 which is guided by means of pins 49 passing through suitable bores of the slide 23. The end of the lever 25 engages between the flange portions of the slide 23 and it is formed with a socket providing a seat for a block 50 bearing on the plate 48 and adapted to force the same into clamping engagement with the plate 47, the said block being adapted to be adjusted by means of a screw 5l. The construction of the cam 17 is shown in detail in Figs. 13 and 14. As appears from the said figures the cam comprises a helical portion 52 having uniform pitch and mounted for imparting feeding movement tothe slide 23, and a portion 54 disposed eccentrically around the shaft 65, the object of the said portion 54 being to rock the lever 25 with its outer end into clamping engagement with the block 50. The relative arrangement o`f the cam faces is such that feeding movement is imparted to the slide 23 while the portion 54 forces the plate 48 downwardly and into clamping engagement with the wire placed between the same and the plate 47, and that the lever 25 releases the block 50 upon its return movement.

The feeding member 24 and its driving means are similar in construction to the feeding and driving means 23, 17, but the driving and feeding means are timed so that the wire is first advanced by the feeding means 23 so far that the hammer 40 im arts a first blow to the projecting end of t e wire, and that thereafter the feeding means 23 release the wire and the feeding means 24 advance the wire another step so that the head is completed by another blow of the hammer.

The construction of the clamping jaws 36 and 37 is shown in detail in Fig. 6. The jaw 36 is mounted in a block 66 secured to the table 64. The movable jaw 37 is disposed in a slide 56 guided in the bearing 38 and rigidly connected with a bolt 57 guided in a bearing sleeve 58 and acted upon by a spring 59 tending to retract the jaw 37 away from the jaw 36, said spring being disposed within the sleeve 58 and bearing on a collar 68 of the bolt 57. The bolt 57 is adapted to be forced to the left in Fig. 6 by the cam 2() for closing the jaw 37 on the fixed jaw 36. The construction of the hammer 40 is shown in detail in Fig. 10. It is mounted in a bearing sleeve 41 secured to the table 64, and the lever 42 acts on the outer end of the said hammer for forcing the same towards the blank and forming the head thereon, a spring 61 tending to retract the hammer away from the blank.

The cutting apparatus isshown in detail in Figs. 5, 7, 8 andy 9. It consists of a rod 30 having an axial bore for the passage of the wire therethrough 4and fixed inI a block by means of a clamping screw 71, and a blade 31 fixed to a bolt 62 rigidly connected with the lever 32. 'Io the end of the said bolt 62 a leaf spring 63 is secured, which is adapted to keep down the head of the pin until the shank of the pin has been cut ofi'. When omitting the said spring the pin would jump upwardly as is shown in Fig. 7 in broken lines so that the further manipula- 'tion ofthe pin would be interfered wit In the operation of the machine the blank is first fed with its left hand end towards the hammer 40 and clamped between the jaws 36, 37, whereupon the hammer forms a head thereon. Thereafter the jaws are opened, the hammer is retracted, and the slide 24 engages the wire and advances the same another step, whereupon the jaws 36, 37 are again closed and the hammer imparts another blow to the end of the wire thus completing the head. After the head has thus been formed the in is cut by means of the blades 30, 3l, wliereupon the clamping members 36, 37 are separated from each other, and the cut blank falls through a hole 73 made in the table 64 into a gutter 44, which gutter conveys the pin to the grinding roller 45.

By reason of the new construction of the driving mechanism lthe velocity of the opere ation of the machine can be materially increased, so that the pins are disposed within the guide Way 44 in close relation to one an other and in vertical position, as shown in Fig. 3, so that they are uniformly acted upon by the grinding tool 45. In machines lnovv in use the relative distance of the pins is comparatively large by reason of the low velocity of the operation. Therefore ,the 'pins are frequently set in inclined positions, so that uniformpointing by the grinding .roller 45 is` impossible.

While in describing the invention refer ence has been made to a particular example embodying` the same I Wish it to be Vunderstood that my invention is not'limited Vto the construction :shown in the drawings, `*and that various vchanges may be made inthe general .arrangement of the apparatus and the construction of ,its parts Without depart ing from the invention.

I claim: l

1. In a machine for manufacturing pins, the combination with .heading means for .effecting the insertion .and advancing of the Wire including ytwo `double acting levers each including a pair yof relatively movable clamping jaws, one of .the levers effecting the insertion of the wire andthe other the advance of the wire said levers acting alternately with respect to each other for feeding and advancing actions, substantially as and for vthe purposes set forth.

2. A machine for manufacturing pins, including means for feeding a wire, a heading means, cutting means, a driving shaft for said means disposed parallel tothe direction of the feed of said Wire and in approximately the same plane thereof, and a plurality of pivotally mounted cam operable levers associated with the shaft and the feeding, heading and cutting means.

3. In a machine for manufacturing pins, the combinationl with heading means, of a plurality of blank feeding members each including blank clamping means, driving mem-V bers mounted for horizontal Swingin and vertical movement and connected wit the blank clamping means of the feeding members, and means for operating the driving members alternately with respect to each` 4. In a machine vfor manufacturing pins,. the combination with headmg means, of a plurality of Wire feeding members acting a1- ternately with respect to each other for effecting the insertion and advance of the wire `with respect to the heading means.

5. A machine for manufacturin claimed in claim 4, wherein the feeding members include aguideway, slides reciprocable therein, clamping jaws on the slides, one of 4which is movable with respect to the other, horizontally swingable levers associated with the clamping .jaws in the slides, and rotatable cams for effecting alternate swinging and vertical movement of the levers in` timed relation with respect to eachother, substantially as and for the purposes set forth.

In testimony whereof I hereunto aiiix my signature.

HANS PRYM.

pins as 

